Microwave-induced π-junction transition in a superconductor/quantum dot/superconductor structure
Yu Zhu, Wei Li, Tsung-han Lin, Qing-feng Sun
DOI 10.1103/PhysRevB.66.134507 · Physical Review B
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Abstract
Using the nonequilibrium Green function, we show that microwave irradiation can reverse the supercurrent flowing through a superconductor/quantum dot/superconductor structure. In contrast with the conventional sideband effect in normal-metal/quantum dot/normal-metal junctions, the photon-assisted structures appear near E0=(n/2)ħω(n=±1,±2⋅⋅⋅), where E0 is the resonant energy level of the quantum dot and ω is the frequency of microwave field. Each photon-assisted structure is composed of a negative and a positive peak, with an abrupt jump from the negative peak to the positive peak around E0=(n/2)ħω. The microwave-induced π-junction transition is interpreted in the picture of photon-assisted Andreev bound states, which are formed due to multiple photon-assisted Andreev reflection between the two superconductors. Moreover, the main resonance located at E0=0 can also be reversed with proper microwave strength and frequency.
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